Detector-tube circuit



Nov. 25, 1930. R, L, HILES 1,782,500

DETECTOR TUBE CIRCUIT Filed Sept. 1, 1928 125ml? mz'zw,

INVENTOR ATTORNEY I vention.

Patented Nov.2 5, l l i r l r 1 v A UNITED STATES PATENT OFFICE ROBERT?LESLIE CHILES, on KNOXVILLE, TENNESSEE DETECTOR-TUBE CIRCUIT-Application filed September 1, 1928. Serial No. 303,499. Q

This invention relates to improvements in posts of the amplifying devicewith the conradio recelvlng sets, the general object of the denserconnected with the plate circuit and invention belngf to provide meanswhereby the negative line for the tube filaments ahead two or moredetector tubes can be used in the of the supply.

5 set so as to secure a smoother tone and in- As before stated,thisarrangement will pro- 55 creased volume, while decreasing fading, asduce smoother tones, with increased volume what one tubefa ls to pickup, the'other (or while decreasing fading, as what one detec others) isllkely; to find, one tube acting withtor tube fails to pick up, theothers are likely out interiermg with the other; to find and each tubewill put what it detects i This invention also consists in certainintothe audio side without interfering with 09 V gther features ofconstruction andin the com- 7 the other tube. inationland arrangement ofthe several It is thou 'ht from the fore oin descri parts, to behereinafter fully described, illustion that the advantages and hove?featur eis trated in the accompanylng drawing and of thefinvention willbe readilyapparent.

specifically pointed out in the appended It is to be understood thatchanges may be 05f laim, made in the construction and in, the combina-In describing the invention in detail,refertion and arrangement of theseveral parts i ence will be had to the accompanying drawprovided thatsuch changes fall within the: 111g, which is a diagrammatic View oftheinscope of the appended claim. i

v i What I claim is v 1 70 The drawing shows two detector tubes T, Aradio receiving set comprising a numthough, of course, it will beunderstood that ber of detector tubes, means for connecting more thantwo tubes can be used, if desired, the filaments of the tubes with asource of and the negative binding posts of these tubes supply,"meansfor connecting the grid posts are-connected by a conductor 1 with thenegaof the tubes witha coil, a grid condenser and tive side oftheFAbattery B and the posileak arranged in theicircuit between each tiveposts of the tubesare connected by a grid post and coil, means forconnecting-the conductor 2with' the positive side of the batplatepostsof the tubes with a transformer teryand a condenser connected with theplate i The coil 0 is connected by the conductors 8 post circuit andwith the negative filament v I with the grid binding posts of the tubesand ClI'CLlIli].... V i i p v a separate grid condenser and grid leak 4is In testimony whereof I afliX my signature.

placed in the line adjacent each tube. o i ROBERT LESLIE CHILES, Theplate postsof thetubes are connected. i r

i post of the amplifying transformer 6 and a .00025 condenser 7. isconnected by the conductors 8 with the line 1 and the line 5.

WVhen more than two detector tubes are by the conductors 5 with-theplate binding p 7 i j i I 40 used, these other tubes are connected withl i i i the second tube T by .the conductors 9 which are shown in dottedlines in thedrawing. Thus it will be seen that the positive ter.

minals of the tubes are connected with the l negative side of thesource, with the grid, i I

posts of the tubes connected in multiple with the coil, with a separategrid condenser and grid leakfor each grid binding posts The platebindingposts of the tubes are connected in multiple with the 'platebinding" I i i

